Add SettingsFontFamily for SpaLib

So we could get the font family from config and apply them to SPA.

Bug: 235727273
Test: Manual with Settings App
Change-Id: I2af44e3a73db2c1a1d21630b6c16cb58a745c4b1

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/framework/theme/SettingsFontFamily.kt

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@file:OptIn(ExperimentalTextApi::class)
+
+package com.android.settingslib.spa.framework.theme
+
+import android.annotation.SuppressLint
+import android.content.Context
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalInspectionMode
+import androidx.compose.ui.text.ExperimentalTextApi
+import androidx.compose.ui.text.font.DeviceFontFamilyName
+import androidx.compose.ui.text.font.Font
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+
+internal data class SettingsFontFamily(
+    val brand: FontFamily = FontFamily.Default,
+    val plain: FontFamily = FontFamily.Default,
+)
+
+private fun Context.getSettingsFontFamily(inInspection: Boolean): SettingsFontFamily {
+    if (inInspection) {
+        return SettingsFontFamily()
+    }
+    return SettingsFontFamily(
+        brand = FontFamily(
+            Font(getFontFamilyName("config_headlineFontFamily"), FontWeight.Normal),
+            Font(getFontFamilyName("config_headlineFontFamilyMedium"), FontWeight.Medium),
+        ),
+        plain = FontFamily(
+            Font(getFontFamilyName("config_bodyFontFamily"), FontWeight.Normal),
+            Font(getFontFamilyName("config_bodyFontFamilyMedium"), FontWeight.Medium),
+        ),
+    )
+}
+
+private fun Context.getFontFamilyName(configName: String): DeviceFontFamilyName {
+    @SuppressLint("DiscouragedApi")
+    val configId = resources.getIdentifier(configName, "string", "android")
+    return DeviceFontFamilyName(resources.getString(configId))
+}
+
+@Composable
+internal fun rememberSettingsFontFamily(): SettingsFontFamily {
+    val context = LocalContext.current
+    val inInspection = LocalInspectionMode.current
+    return remember { context.getSettingsFontFamily(inInspection) }
+}

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/framework/theme/SettingsTypography.kt

@@ -20,14 +20,13 @@ import androidx.compose.material3.Typography
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.compose.ui.text.TextStyle
-import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.em
 import androidx.compose.ui.unit.sp
 
-private class SettingsTypography {
-    private val brand = FontFamily.Default
-    private val plain = FontFamily.Default
+private class SettingsTypography(settingsFontFamily: SettingsFontFamily) {
+    private val brand = settingsFontFamily.brand
+    private val plain = settingsFontFamily.plain
 
     val typography = Typography(
         displayLarge = TextStyle(
@@ -140,5 +139,6 @@ private class SettingsTypography {
 
 @Composable
 internal fun rememberSettingsTypography(): Typography {
-    return remember { SettingsTypography().typography }
+    val settingsFontFamily = rememberSettingsFontFamily()
+    return remember { SettingsTypography(settingsFontFamily).typography }
 }